Statoil starts production at Tyrihans subsea tieback offshore Norway

Source: Statoil

The Tyrihans subsea field in the Norwegian Sea is making a considerable contribution to Statoil’s production on the Norwegian continental shelf (NCS). The Tyrihans field will be officially opened at a ceremony in Trondheim on Thursday, March 24, 2011. 

The Tyrihans field consists of Tyrihans South, a gas-capped oil field, and Tyrihans North, a gas and condensate field with thin oil zone. 

Tyrihans consists of five seabed templates. Four of the templates are used for production and gas injection, while the fifth is used for sea water injection. 

Technology developed in connection with Tyrihans sets a new standard for the development of seabed fields.
Tyrihans is tied back to the installations and infrastructure on the Kristin and Åsgard fields on Haltenbanken.
The well stream is transported through a 43.6 km long pipeline to Kristin for processing. The gas is exported from Kristin via the Åsgard transport pipeline to the Kårstø facility in Rogaland. 

Oil and condensate are piped to the storage vessel Åsgard C for onward transport by tanker. 

The volumes in the field are of similar magnitude to those on Kristin and both fields share a joint operational organisation. 

“Tyrihans will for many years to come make a considerable contribution to our production on the NCS, and will be strategically significant for the development of our activities in the Norwegian Sea,” says Øystein Michelsen, executive vice president, Development and Production Norway. 

Early involvement and close cooperation between the various disciplines within petroleum technology, drilling and well, made possible the development of well equipment specially designed for this field. 

New well technology has ensured that the recovery rate on Tyrihans is higher than initially expected when production started up in the summer of 2009. 

Multilateral and smart wells with downhole regulatory equipment have improved the overall control of reservoir production. 

Pumps for sea water injection placed directly on the seabed also help boost recovery.

In the 20 months since coming on stream, the Tyrihans field has exceeded all production expectations. The field currently produces around 100,000 barrels per day and, together with the Kristin field, it fills the total capacity for the export of oil and condensate from the Kristin platform.

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